Relegation-threatened Livorno have sacked Domenico Di Carlo after just 88 days in charge and re-appointed Davide Nicola.
Virgil van Dijk claims he knows nothing of interest from English clubs and is keen to prove himself in the Champions League with Celtic.
Goalkeeper Jason Brown has left Aberdeen with immediate effect.
The Wales international made 28 appearances for the Dons after arriving from Blackburn 18 months ago, but has been unable to displace Jamie Langfield his season.
Pittodrie chief executive Duncan Fraser told the club's official website: "Jason made it clear to us he was keen to return to England and continue his career.
"He is a proud member of the Welsh international team and in order to maintain his place in the squad he feels it is vital for him to be playing every week.
"The club wish Jason all the best with his future career."